Ester groups and hydroxyl groups of a polyester composed of 1, 4-cyclohexanedicarboxylic acid (CHDA), isophthalic acid (iPA), 1, 4 -cyclohexanedimethanol (CHDM) and 1, 5 -pentanediol (PD) have been characterized by
1H NMR quantitatively and PD centerd triad of the polyester has been characterized by
13C NMR qualitatively. The process in the polycondensation and the transesferification without catalyst was pursued with
1 H NMR and
13C NMR and following results were obtained.
1) The hydroxyl groups of CHDM and PD are consumed at the almost same rate, while the carboxyl groups of CHDA and iPA are consumed at different rates at the initial stage of the polycondensation.
2) The polycondensation gives the polyester with almost randam monomer sequence. 3) Transesterification dose not occure at this condition.
Consequently, alcoholysis, acidolysis and hydrolysis during the polycondensation lead to the p olyester with an almost randam monomer sequence at this condition.
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